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Alga (singular of algae) is an example of an autotroph because it is capable of photosynthesis.
Click on image for full sizeImage courtesy of Corel Photography

Autotrophs

Autotrophs are organisms that can "make their own food" from an inorganic source of carbon (carbon dioxide) given a source of energy. Most autotrophs use sunlight in the process of
photosynthesis to make their own food. Photosynthesis is the name of the process which autotrophs use to
convert water, carbon dioxide, and solar energy into sugars and oxygen. Examples of autotrophs are plants and algae (shown in the picture).

Autotrophs are the producers of the food chain. The word autotroph comes from the Greek autos=self and trophe=nutrition.

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